The Doctor and Bill in “The Lie of the Land”

Human society is… stagnating. You've stopped moving forward. In fact, you're regressing.

Well, this isn't exactly much better.

It's safer.

Not so much for the people the Monks are killing.

The Romans killed people and saved billions more from disease. War. Famine. And barbarism.

No, wait. What about free will? You believe in free will. Your whole thing is - you made me write a 3000-word essay on free will!

Yes, well, you had free will, and look at what you did with it. Worse than that, you had history. History was saying to you, "Look, I've got some examples of fascism here for you to look at. No? Fundamentalism? No? Oh. Okay. You carry on." I had to stop you, or at least not stand in the way of someone else who wanted to. Because the guns were getting bigger, the stakes were getting higher, and any minute now, it's gonna be "Goodnight, Vienna". By the way, you never delivered that essay.

Because the world was invaded by zombie monks!